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JC,

[Comments follow your text]

jcpearce wrote:
Thanks Evan, I have eyed that book at the local bookstore and given
that you mention there is a section (and paranoid no less, a good
thing) on this I'll purchase a copy. Books like this can save a lot of
hair being pulled out.

The enclosure I made is riveted and there are very small gaps in
addition to where the mandrel pulls out leaving a small hole. Would
encompassing the whole thing in aluminum foil (as a test, not for
deployment) accurately simulate these sophisticated seals? Before going
through that effort I would want to know what, if any, gain I may
derive.


Well, when last I did this, I remember the RF "bonding" tape was nickel
plated coper foil with a collodial silver stickey backing. As I
remember, it worked perfectly, if somewhat expensively. Since this was a
little more than 10 years ago, I imagine that there have been some
cheaper alternatives developed since then.

Your problem when using tin foil will be getting it at the precise
potential of the rivited box underneath it. To accomplish this, it needs
to be "bonded", ie electrically grounded to the main box at regular
intervals. What these intervals is, has either to be determined
experimentally, or solved via the paranoid method (nickel plated coper
tape with $ilver......).

Ultimately, I think the better solution would be to get some cheap
double or single sided FR11 PC board and solder it together with coper
foil (cheap at your local electrical supply). To seal the top, you are
going to have to order some king of conductive compression tape (cheap
from digikey.

If you are interested, email me off group & I'll see if I can find you
some hardware ideas from Digikey.

Evan
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